Many streamers encounter these issues when first opening OBS or TikTok: after adjusting parameters for a long time, black bars still appear on both sides of the screen; despite using a 1080P camera, the livestream still looks blurry; or when switching from landscape to portrait mode, the image ends up horizontally squashed—no matter how many settings they change, the problems persist.
In fact, these issues almost always stem from two core settings in the streaming software: the aspect ratio and resolution of the canvas, and the aspect ratio and resolution of the camera feed.
If these two "frames" don’t match, the livestream will display awkward effects like black bars, stretching, distortion, or squashing.In this article, EMEET breaks down the logic of the "blue frame vs. red frame" once and for all: from the principles of 16:9 and 9:16 aspect ratios, to the visual effects when the canvas and camera feed do or don’t align, and finally to step-by-step OBS setup for clean landscape or portrait streaming. Whether you’re just starting out or have been plagued by black bars for a while, this guide should help you solve it.
1. Aspect Ratio and Resolution Knowledge
| Landscape (16:9) resolutions | Portrait (9:16) resolutions |
|---|---|
|
The webcam defaults to a 16:9 landscape aspect ratio. Common 16:9 resolutions: 3840×2160, 2560×1440, 1920×1080, 1280×720.
|
The portrait aspect ratio is 9:16. Common 9:16 resolutions: 2160×3840, 1440×2560, 1080×1920, 720×1280.
|
2. Effects of Aspect Ratio and Resolution Settings
- Canvas aspect ratio: refers to the output aspect ratio set in software such as OBS or other live streaming software; it determines the orientation of the blue frame.
- Canvas resolution: refers to the output resolution set in OBS or other live streaming software; it determines the maximum resolution of the live stream.
- Camera-feed aspect ratio: refers to the aspect ratio of the connected camera feed set in OBS or other live streaming software; it determines the orientation of the red frame.
- Camera-feed resolution: refers to the resolution of the connected camera feed set in OBS or other live streaming software; it determines the size of the red frame.
These four settings directly affect the live stream display. See the diagram below (blue frame = the live stream canvas, red frame = the camera feed area, and blue frame ≥ red frame).
2.1 When the canvas and the camera feed match in both aspect ratio and resolution
| Canvas in landscape mode & camera view in landscape mode Canvas resolution = camera view resolution |
Canvas vertical screen & camera view vertical screen Canvas resolution = camera view resolution |
|---|---|
 |
 |
2.2 The effect when the canvas's landscape/portrait orientation does not match the camera feed's landscape/portrait orientation
The image within the blue box will be live-streamed, but a black screen is displayed between the red box and the blue box
| Canvas in landscape orientation, camera view in portrait orientation | Canvas is in portrait mode, camera view is in landscape mode |
|---|---|
 |
 |
2.3 When the canvas and the camera feed do not match in resolution
| Canvas resolution > camera resolution | Canvas resolution < camera resolution |
|---|---|
| The content inside the blue frame is broadcast, while the area between the red frame and the blue frame is shown as black bars. | The content inside the blue frame is broadcast; the portion of the camera feed that extends beyond the blue frame is cropped. |
 |
 |
Note: the two diagrams above show the default behavior. You can also drag to enlarge or shrink the red frame in the software so that the red frame fills the blue frame.
3. Effects of Aspect Ratio Settings Combined with Camera Placement
To achieve a satisfactory vertical-screen live stream, you need both: 1) a portrait canvas, and 2) a portrait camera feed. The table below summarizes how the canvas aspect ratio, the camera-feed aspect ratio, and the camera placement angle together affect the final live stream output. Both the canvas resolution and the camera-feed resolution are 1080p.
|
Live stream canvas (blue frame)
|
Landscape live stream
|
Portrait live stream
|
||||||
|---|---|---|---|---|---|---|---|---|
|
Camera-feed aspect ratio (red frame)
|
Portrait
|
Landscape
|
Portrait
|
Landscape
|
||||
|
Camera placement
|
 |
 |
 |
 |
 |
 |
 |
 |
|
Live stream effect
|
 |
 |
 |
 |
 |
 |
 |
 |
|
Note
|
Black bars on both sides
|
Black bars on both sides; the image rotates 90 degrees
|
Image rotates 90 degrees
|
Landscape live streaming
|
Vertical Screen Live Streaming
|
Image rotates 90 degrees
|
Black bars on both sides; the image rotates 90 degrees
|
Black bars on both sides
|
4. Use Cases for Landscape and Portrait Live Streaming
| Landscape live stream | Portrait live stream |
|---|---|
| 16:9 aspect ratio. Optimized for desktop and TV viewing. Best for gaming, online seminars, and event live streams. Commonly used with OBS and so on. | 9:16 aspect ratio. Optimized for full-screen viewing on mobile phones and tablets. Best for daily sharing, makeup tutorials, and e-commerce live streams. Commonly used with Tiktok and so on. |
OBS's landscape and portrait settings
5. Common Live Stream Layouts
5.1 Common layout patterns for landscape live streaming
| Landscape camera feed filling the landscape canvas | Landscape camera feed scaled down into a corner of the landscape canvas | Portrait camera feed scaled down into a corner of the landscape canvas |
|---|
5.2 Common layout patterns for portrait live streaming
| Portrait camera feed filling the portrait canvas | Portrait camera feed scaled down to occupy 2/3 of the portrait canvas | Landscape camera feed scaled down to occupy 1/3 of the portrait canvas |
|---|
5.3 Standard portrait live streaming
Setting up the portrait camera feed
- Mount the camera on a tripod with a pan head and rotate it 90°.
- In the live streaming software, set the camera to rotate 90°.
Detailed steps for portrait live streaming
|
|
|
|
5.4 Using third-party streaming software for portrait live streaming
- Standard portrait live streaming: follow the workflow described in section 5.3.
- Advanced requirements (richer beautification, flexible overlays, simultaneous multi-platform streaming): use a third-party streaming tool such as OBS.
Using OBS virtual camera for simultaneous portrait live streaming on Tiktok and Youtube.
Set up a 90° camera rotation and portrait canvas, configure OBS to a portrait canvas resolution, let OBS output a portrait virtual camera, and stream to Tiktok Live Companion and Youtube simultaneously for dual-platform live streaming.
Steps
|
|
|
|
|
|
|
|
